import React, { Component } from "react";
import {nanoid} from 'nanoid'
import PropTypes from 'prop-types'
import "./index.css";

export default class Herder extends Component {

  static propTypes = {
    addTodo:PropTypes.func.isRequired
  }

  handleKeyUp = (event) => {
    const { keyCode, target } = event;
    if (keyCode !== 13) return;
    if(target.value.trim() === ''){
        alert('输入不能为空!')
        return
    }
    const todoObj = { id: nanoid(), name: target.value, done: false };
    this.props.addTodo(todoObj);
    target.value = ''
  };

  render() {
    return (
      <div className="todo-header">
        <input
          onKeyUp={this.handleKeyUp}
          type="text"
          placeholder="请输入你的任务名称，按回车键确认"
        />
      </div>
    );
  }
}
